The invention relates to a processing method for fermenting straws in a dry-process and wet-process combined way, which can realize dry-process and wet-process combined fermentation treatment of straw garbage through a straw pre-softening step, a solid-liquid primary fermentation step, a dry-process aerobic digestion and decomposition step, a wet-process anaerobic digestion step and a desulfurization and drying step. By means of the method disclosed by the invention, kitchen garbage is subjected to resource treatment safely and effectively; the harmless treatment is realized; the treatment process is free from pollution; bacterial virus can be prevented from spreading; and the method is an environment-friendly straw garbage treatment method, has good economical efficiency and is capable of realizing virtuous ecological cycle.